Idea: Provide a way to submit keys via email
The other day we were testing the Autocrypt plugin for Thunderbird, and tried to find a way to submit the generated certificate to hagrid. The only way to extract the key that we found was to make a backup/send a setup message, but that is obviously not a sane way to do that.
Then it occurred to me that one could simply send a mail and have hagrid extract the certificate from the Autocrypt header.